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They may act through different pathways
Trouble arises when the body produces too much or struggles to break it down, leading to intolerance
Obviously officially we cannot advise you to use anything that is out of date
Most patients (provided they are lean) will be able to put a subcutaneous needle VERY close to the muscle (if not inside) depending on the site they use for the injection
This allows vitamin B12 to be delivered directly into the body
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